Lock



R. E. BROWN.

LOCK.

v APPLICATION FILED JULY 31. I919.

Patented J unel, 1920.

2 SHEETS-SHEET I.

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1905/ g .B TOWIL R. E. BROWN.

LOCK.

APPLICATION FILED JULY 31,1919.

2 SHEETS-SHEET 2- Patented June 1, 1920.

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ROY E. BROWN, OF PORTLAND, OREGON, ASSIGNOR OF ONE-THIRD T0 GEORGE A...

i AIL-BRIGHT, 0F PORTLAND, OREGON.

LOCK.

Specification of Letters Patent.

Application filed July 31, 1919. Serial No. 314,491.

either side. The invention is primarily designed for use upon swinging doors but is also applicable to sliding or folding doors and to the locks of trunks and similar re- The invention is illustrated in the accompanying drawings and resides in certain novel features which will be hereinafter first fully described and then particularly pointed out in the appended claims.

In the drawings- Figure 1 is an elevationof the lock with one side of the casing removed and showing the bolt projected; A

Fig. 2 is a similar view showing the parts arranged to permit opening of the door by a person outside the building;

Fig. 3 is a horizontal section on the line 3-3 of Fig. 1;

Fig. 4L is a view similar to Fig. 1 but showing the bolt retracted and showing the parts arranged to permit free opening of the door from either side;

Fig. 5 is a view showing the lock casing in section and the tumblers in edge elevation;

Fig. 6 is a face view of so much of the lock casing as appears in Fig. 5.

The application of the invention to a swinging door lock is illustrated in the drawings in which the reference numeral 1 indicates the lock casing and 2 the bolt slidably mounted in the upper portion of the casing. The bolt is provided with a reduced inwardly extending tongue 3 having a longitudinal slot 4 through which a knob spindle may extend from the inner side of the door and this spindle carries at its outer end a crank or lever arm 5 which bears'against an offset or lug 6 upon the tongue 3 whereby when the spindle is rocked the said crank or lever arm will cause the bolt to. slide inwardly and permit swinging of the door, the projected and retracted positions of the bolt being shown in Figs. 1 and 4:, respectively. A knob 7 is secured on the inner end of the said knob spindle to facilitate its manipulation and a spring 8 is, disposed within the upper portion of the casing and bears against the inner end wall of the casing and against a shoulder 9 on the bolt so that by its expansion the spring serves to normally hold the bolt projected. To the under side of the bolt, I pivot one endof a hook 10 which has its beak 11 arranged to be engaged by a plurality of tumblers whereby, when the tumblers have beenproperly adjusted, rotation thereof will exert a pull through the hook upon the bolt to retract the 13 rotatably mounted in the inner face plate of the lock casing and upon the inner 5 does not extend through the outer face plate of the lock casing so that it can not be manipulated from the outsideof the door. To permit operation of the bolt from the outer side of the door, I provide a tumbler. shaft 15 which is journaled in the face plates of the lock casing and extends through the outer face plate to carry a knob or other handle 16 and secured upon the said shaft to rotate with the knob 16 is a dial l7 carrying a scale of numerals or other indicating characters, the face plate of the lock casing being provided with an index 18 of any desired form arranged immediately adjacent identical construction, being each provided 105 in its edge with a substantially V-shaped same. A stop latch 12 is carriedby a stem spindle which carries the crank or lever arm the edge of the dial 17 so that an authorized notch or recess 22 to receive the beak 11 of the hook and lugs 23 being disposed upon the opposed faces of the tumblers to set the tumblers by being brought into contact through manipulation of the handle or knob 16. Spacers 2e are fitted upon the tumbler shaft between the tumblers so as to hold them inthe proper spaced relation and prevent,

' the will of the owner, I prefer to employ headed pins adapted to be inserted in any one of the series of openings or sockets 25 formed in the tumblers adjacent the peripheral edges thereof. It will be readily understood that the combination of the lock may be readily changed by shifting the pins and setting them in different openings of the respective tumblers Upon reference to Fig. 1, of the drawings, it will be readily noted that the beak 11 will ride upon the periphery of a tumbler unless said tumbler is so set that the notch therein willbe below the beak and, consequently, the bolt may be freely retracted by the inner knob 7, but manipulation of the outer knob 16 will have no effect upon the bolt unless the said knob is rotated in the proper direction and inthe proper manner to bring the notches of all the tumblers into position below the beak whereupon the beak will drop into the notches and rotation of the tumblers to the right will pull upon the hook so as to. retract the bolt.

To bring the notches of all the tumblers into alinement with each other and vwith the beak 11, as shown in Fig. 2 the knob 16 must be rotated or rocked in a manner determined by the combination for which the tumblers have been set by the adjustment of the lugs 23..

The outer tumbler 19 will always move with the tumbler shaft to which the knob 1.6 is secured but the tumblers 20 and 21 will not move with the shaft unless the lug 23 of the tumbler 19 has been brought against the lug on the outer face of the tumbler 20 and the shaft then rotated or rocked to bring the lug on the rear face of the tumbler 20 against the lug on the tumbler 21. It is obvious that continued rotation of the tumbler shaft in one direction will bring the lug 23 on-the tumbler 19 against the lug on the front face of the tumbler 20 and then bring the lug on the rear faceof the tumbler 20 against the lug on the tumbler 21, but such a simple manipulation of the tumbler shaft will not bring the notches 22 into proper falinement. To bring the notches into the proper alinement, the tumblers must beset in the manner determined by the positions of the several lugs as will be readily understood. The initial rotation of the knob 16,

therefore, willv continue until the inner tumbler 21 has been set with its recess or notch 22 under the beak 11 and this position of the tumbler will be denoted by the numeral or other character upon the dial 17 which represents the first element of the vcombination alining or registering with the index 18. The tumbler shaft is then rotated in the opposite direction so that the tumbler 21 will remain at rest and the lugs upon the adjacent opposed faces of the tumblers 19 and 20 will be reengaged but with the lug upon the tumbler 19 at the opposite side of the lug upon the tumbler 20 from its former position. The tumbler 20wvill then be actuated to bring its notch under the beak 11 which position will be indicated by the character denoting the second elementwof the combination registering with the index 18. The direction of rotation of the tumbler shaft is then again reversed so that the reradial so that it will have an abrupt engagev ment with the beak 11 and exert the desired pull thereon, but the other wall of the notch is disposed at an angle to the radius and the inner surface of the beak is convex so that the rotation of the tumblers to the left will simply cause the beak to ride out of the notches. The index 18 may be a small rib or groove in the face plate of the lock casing and for convenience, I have illustrated it as a slight groove or indentation, as clearly shown in Fig. 5. Opening of the door from within a room or building is not dependent on the combination but is effected by merely rocking the knob spindle so that the crank 5 will assume the position shown in Fig. 4 and withdraw the bolt through engagement with the offset 6. Of course, if the spindle be left in this position, the bolt will be held retracted inasmuch as the crank will be at a right angle to the planeof the offset or shoulder and the door may be opened freely from either side but as the spindle is apt to be moved by chance contact with a passing object and the bolt thereby released, I provide the dead latch 12. When this latch is to be used, the combination must be worked so that the tumblers will be set to withdraw the bolt and the latch vwill be swung down after the door has been opened. The latch willbear upon the hook so thatit cannot rise from the notches 22 and clear the tumblers and, consequently, the bolt will'be held retracted;

From the foregoing description, taken in connection with the accompanying drawings, itwill be seen that I have provided an exceedingly simple permutation mechanism whereby a lock may be readily opened when the combination is known but cannot b opened by unauthorized persons.

Having thus described the invention, what is claimed as new is:

1. In a lock, the combination of a bolt, means for holding the bolt normally proj ected, a hook pivoted to the bolt, a plurality of tumblers disposed below the hook, means for setting the tumblers to engage the hook and retract the bolt, and a latch pivotally mounted between the bolt and the free end of the hook to bear upon the hook and hold the same in engagement with the tumblers with the bolt retracted.

2. In a lock, the combination of a bolt mounted in the upper portion of the lock and having a longitudinal slot and an offset in rear of said slot extending entirely across the bolt; a knob spindle mounted in one side of the lock and passing through the slot in the bolt, a crank on the inner end of the knob spindle bearing against the offset on the bolt, yieldable means acting on the bolt in opposition to the said crank whereby to normally hold the bolt projected, a hook pivoted at its front end to the bolt near the front end thereof and provided at its inner of tumblers mounted below the said hook and provided with peripheral notches to be engaged by said beak, means for setting the tumblers whereby to bring the notches into alinement with each other and the beak, and means acting on the hook to hold the beak in engagementwith the notches after the bolt has been retracted.

3. In a lock, the combination of a bolt, means for holding said bolt normally projected, a hook pivoted at its front end to said bolt near the front end thereof and having a depending beak at its rear end, a plurality of tumblers disposed below the bolt and the hook and having peripheral notches, projections on the opposed faces of the tumblers, means for rocking the tumblers to effect engagement between said projections and set the tumblers with their notches in alinement with each other and with the said beak, and a manually operable latch mounted between the bolt and the hook to bear upon the hook and hold the beak 

